10/14/22

What is the enthalpy change, delta hcomb, per mole of methanol

In a balanced thermochemical equation of the combustion of methanol gas: 2CH3OH + 3O2 = 2CO2 + 4H2O + 1452kJ
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10/14/22

Determine whether a NH4C2H3O2 solution is acidic or basic based on Ka and Kb values. Show all calculations and reasoning.
Determine whether a NH4C2H3O2 solution is acidic or basic based on Ka and Kb values. Show all calculations and reasoning.
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10/14/22

AP Chemistry Thermodynamics
The solid in question 2 was aluminum sulfate, AL2(SO4)3. Calculate the molar heat of solution, delta H solution (in kJ/mol) for aluminum sulfate. Hint: The units for molar heat of solution are... more
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10/14/22

What is the enthalpy change (ΔH) associated with the reaction as written?

Full question: An amount of solid BaCl2, 20.8g. is dissolved in 100g of water in a coffee-cup calorimeter by the reaction: BaCl2 (s) ---> Ba2+(aq) + 2Cl-(aq)The water is originally at 25oC and... more
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10/13/22

Gaseous ethane (CH3CH3) will react with gaseous oxygen (O2) to produce gaseous carbon dioxide (CO2) and gaseous water (H2O)

Suppose 27.4 g of ethane is mixed with 42. g of oxygen. Calculate the maximum mass of water that could be produced by the chemical reaction. Be sure your answer has the correct number of... more
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10/13/22

Lewis structure of CO3-²
Draw the Lewis structure of CO3-²
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10/13/22

How many moles of oxygen are in 123 g of Cr(SO4)3
PLEASE SHOW THE WORK THOROUGHLY SO I CAN UNDERSTAND.
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10/13/22

Find [OH-] in 4M aq. NaOH
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10/13/22

Copper is extracted from the ore, chalcopyrite, CuFeS2. How many kilograms of a 0.862% chalcopyrite ore will be necessary to produce 1.00 kg of pure copper?

The percentage of copper in chalcopyrite needs to be known to work this problem.
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10/12/22

general chemistry
How many mL of 0.274 M solution must be measured out if 0.6934 g of H2SO4 is required?   mL
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10/12/22

help with chem please
A 1.207 g1.207 g sample of a new organic material is combusted in a bomb calorimeter. The temperature of the calorimeter and its contents increase from 23.57 ∘C23.57⁢ ∘C to 28.72 ∘C.28.72⁢ ∘C.The... more
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10/12/22

help with chem please
Potassium nitrate, KNO3KNO3, has a molar mass of 101.1101.1 g/mol. In a constant-pressure calorimeter, 44.844.8 g of KNO3KNO3 is dissolved in 261261 g of water... more
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10/12/22

need help with chem please
Carbohydrates serve as a vital source of chemical energy to the human body. Carbohydrates are broken down into smaller units of glucose, among other sugars, providing energy to various muscles and... more
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10/12/22

Chem 221, struggling with this equation
An unknown element is a mixture of isotopes ¹⁵¹X (atomic mass = 150.99 amu) and ¹⁵³X (atomic mass = 153.03 amu). The average atomic mass of X is 151.69 amu. What is the percent abundance of ¹⁵³X?
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10/12/22

General Chemistry

How many grams of K2Cr2O7 must be added to a 123.8 mL volumetric flask to prepare a 0.307 M K2Cr2O7 solution?
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10/12/22

What is the [OH⁻]

What is the [OH⁻] of a 1.90 M solution of pyridine (C₅H₅N, Kb = 1.70 × 10⁻⁹)?
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10/12/22

Balance the equation Run in an acidic solution: MnO2+Cu+2 + H+-->MnO4-+Cu++H2O
Balance the equation Run in an acidic solution:(Not OH-)MnO2+Cu+2 + H+-->MnO4-+Cu++H2O
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10/12/22

Unbalanced equation: NO (g) + H2 (g) N2 (g) + H2O (l) In one reaction, 63.4 g of H2O is produced. What amount (in mol) of H2 was consumed? What mass (in grams) of N2 is produced?
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10/12/22

Write a net ionic equation for the reaction that occurs when excess hydroiodic acid and barium sulfite (s) are combined
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10/12/22

hydrobromic acid (aq) and sodium sulfide are combined
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10/12/22

For each of the following pairs of ions, write the chemical formula for the ionic compound that they would form. Use proper notation and place the cation first.
For each of the following pairs of ions, write the chemical formula for the ionic compound that they would form. Use proper notation and place the cation first.A) Na+ and Se2-
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10/12/22

construct the proper full electron configuration for a neutral argon atom.
construct the proper full electron configuration for a neutral argon atom.
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10/11/22

How many ions are formed during the dissociation of 500 molecules of carbonic acid, if it dissociates in the first degree by 20%, and in the second degree by 1%?
dissociation’s
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10/11/22

Finding mass from an enthalpy change.
Dissolving an unknown quantity of NH4No3 (molar mass = 80.05 g/mol) to 505g of solution, for which we can assume the same specific heat capacity as water, in a coffee cup calorimeter causes the... more
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10/11/22

Propane burns according to the following equation: C3H8+5O2-->3CO2+4H2O
(a)How many grams of O2 are needed to react fully with 6.18 mol of propane?(b)How many grams of CO2 can form from 0.576 mol oof propane?(c)How many grams of water are produced by the combustion of... more
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